设计与多媒体

image-optimization

Name: image-optimization
Author: secondsky

secondsky/claude-skills

Optimizes images for web performance using modern formats, responsive techniques, and lazy loading strategies. Use when improving page load times, implementing responsive images, or preparing assets for production deployment.

594 次安装
240 星标
收录于 2026.01.25

安装命令

$ npx skills add https://github.com/secondsky/claude-skills --skill image-optimization

SKILL.md

Image Optimization

Optimize images for web performance with modern formats and responsive techniques.

Format Selection

Format	Best For	Compression
JPEG	Photos	Lossy, 50-70% reduction
PNG	Icons, transparency	Lossless, 10-30%
WebP	Modern browsers	25-35% better than JPEG
AVIF	Next-gen	50% better than JPEG
SVG	Logos, icons	Vector, scalable

Responsive Images

<picture>
  <source srcset="image.avif" type="image/avif">
  <source srcset="image.webp" type="image/webp">
  <img
    src="image.jpg"
    srcset="image-400.jpg 400w, image-800.jpg 800w, image-1200.jpg 1200w"
    sizes="(max-width: 600px) 100vw, 50vw"
    alt="Description"
    loading="lazy"
    decoding="async"
  >
</picture>

Lazy Loading

<!-- Native lazy loading -->
<img src="image.jpg" loading="lazy" alt="Description">

<!-- With blur placeholder -->
<img
  src="placeholder-blur.jpg"
  data-src="image.jpg"
  class="lazy"
  alt="Description"
>

Build Pipeline (Sharp)

const sharp = require('sharp');

async function optimizeImage(input, output) {
  await sharp(input)
    .resize(1200, null, { withoutEnlargement: true })
    .webp({ quality: 80 })
    .toFile(output);
}

Performance Targets

Asset Type	Target Size
Hero image	<200KB
Thumbnail	<30KB
Total images	<500KB

Optimization Checklist

Use WebP with JPEG fallback
Implement responsive srcset
Enable lazy loading for below-fold
Compress at quality 70-85
Serve from CDN
Set proper cache headers